Robbins earns hard rock title

10/06/2014

A 2.2 m-diameter Robbins heavy duty double shield hardrock TBM in Fairfax, VA on its seventh project has holed out after a punishing run through diabase of 345 MPa hardness. The machine has set a few new records in its class. Read the press release and visit www.robbinstbm.com. 24/14.

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